Crushing-mill.



. GRUSHING MILL. APPLICATION FILED um. 28, 1901.

Patented Dec. 15, 1908.

N ./W. JA 4. 1 T

T. L. a; T. J. STURTEVANT;

cnusnnm; MILL. APPLICATION FILED MABLQB, 1907.

Pa tentd Dec. 15, 1908.

4 SHEETS-SHEET 2.

T. L. & T. J. STURTEVANT.

oau'snma MILL. APPLICATION FILED MAR. 26, 1907.

- Patented Dec.15,19( )8.

4 stuns-sum a.

in A T. L. & T. J. STUIRTEYANT.

cnusme m. APPLICATION FILED 1A3. 28, 1907.

Patented 1160.: I5, 1908.

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attoznwd,

UNITED STATES THOMAS LEGGETT STURTEVANT, oroijni PATENT OFFICE.-

cr, AND THOMAS JOSEPH STURTEVANT, OF

wnLLcsLEY, MASSACHUSETTS, ASSIGNORS 'ro sTiiiinvANT inii, COMPANY, or PORTLAND, MAINE, A CORPORATION or MAINE,

CRUSHING-MILL,

Patented Dec. 15, 1908.

Application filed March as, 1907. Serial No. 365,054.

' T all'whom itmay concern: I

Be it known that we, THOMAS Leeoii'r'r.

STURTEVANT and THOMAS JOSEPH STURTE- VA N'l, citizens of the United States, residing, respectively, at Quincy and WVellesley,

' in the county of Norfolk and State of Massachusetts, have invented or; discovered certain new and u'setul Improvements 1n Crush1ng-M1lls, of which the follow ng is a specification, reference beinghad therein to.

the accompanying drawings.

Thisinve'ntion relates to that class of mills used for the reduction of ore, cement and similar materials and in which the materi'al to be pulverized is held by centrifugal force on the inner circumference of an anvil ring, and in this position is crushed or reduced by the pressure of a roll or series of rolls acting outwardly in a radial direction against the inner surfaces of the ring, and. which rolls are driven by friction from the rotation of thesaid ring.

One object of the invention is to provide an automatically regulated feeding device 1 for supplying the material to be reduced to a mill of the character above referred to, which shall operate to maintain a substan- :tially constant amount of material in the proper position to be crushed, and which I will prevent clogging ofthe mill by the overfccdingof' material thereto.

Further objects of the invention are to increase the etficiency, convenience and durability of the mills of the character above referred'to, and to make the same morepositive' in action and more reliable and even in output. i

To these ends the improved machine preferably comprises means for separating the i properly crushed material from that which has been only partially reduced, together with a feeding device adapted to' receive from the mill such material :as has been imperfectly reduced and return-this material into a proper position for further reduction, adding thereto suflicient'new mate rial to maintain a constant supply of ma terial between the crushing elements of the mill. The amount of new material thus supplied to the mill is automatically reguturned to the mill in the manner. above referred to. i

l he im'proved machine also comprises an anvil ring having means for positively and rigidly connecting the same to a driving shaft, thereby causing the same to rotate about a fixed axis and making its action more positive and reliable, such means being constructed to permit the discharge of reduced material at both sides of the anvil ring; said machine preferably having a plurality of yieldingly and independently mounted crushing rolls within 'said anvil ring and deriving their motion from frictional contact.

- A preferred form of the'iiivention is illus-f trated in the accompanying drawings, in which taken on line 1--1, Fig. 3, with the lower crushing roll in elevation. Fig. 2 is an end view of the inacliine as viewed frointhe right of Fig. 1. Fig. 3 is a transverse sectional view on the line 33, Fig. 1. Fig. 4

line 4.45, Fig. 1.

As shown in the drawings the working parts of the machine are inclosed in a casing with a suitable discharge opening 18, two end heads 14, 15, removably attached to said base, and a hinged top or cover 16'between said heads and preferably pivoted to -the base 12 at 17, said top or cover being adaptgive access to the interior of the mill.

Mounted in suitable hearings in the'heads 14, 15 is the driving shaft 18 carrying a driving pulley 19. Attached tosaid driving shaft within-the casing'of the mill, to rotate 20 comprising a hub and disk-like part from which extend horizontal arms 21- carrying an annulus 22 to which is secured the anvil ring 23. It will thus be seen that the anvil ring is positively driven from the driving shaft of the mill and rotates about a fixed axis. Said anvil ring is preferably concoiiieahoutw surface fitting a corresponding face in the annulus 22. and is preferably secured in working position in said annulus ed to be easily swung upwardly in order to structed with a slightly tapered or frusto-.

Figure l is a longitudinal sectional View I is a section of the driving Wheel or headon so comprising a base or bed-piece 12, provided A therewith, is a hollow driving wheel or head "by draw-bolts 24: the inclined contiguous faces of the said annulus and anvil ring providing for a wedge-like action in firmly securing the anvil ring in place. The arms 21, forming part of the driving wheelor head, and connecting the annulus 22 with the disk-portion of said wheel, provide means for mounting in proper working position scrapers 25 which will be hereinafter referred to. The annulus 22, carrying the anvil ring 23, being connected with the disk portion of the driving wheel 20 only by the arms 21, proper spaces or openings are afforded between the annulus and the disk portion of said wheel for the proper discharge of the crushed material between said annulus and the disk portion of said wheel,

so that the crushed material may be freely discharged from the inner as well as from the'outer or entirely open side of the anvil ring. 7

The crushing rolls 27 are supported by bearing-pins 28 carried by bearing-carriers 29 pivoted at 30 to the head 15-at the outer side thereof. The bearing-carriers 29 are swung on their pivots, to hold the crushing rolls 27 in contact with the interior surface 7 of the anvil ring 23, by means of springs 31,

all of which are preferably mounted in a single spring holder or case 32 which is bolted or otherwise suitably secured to the head 15- or to the. shaftbearing carried thereby. The pressure of the springs 31 -is communicated .to the bearing-carriers 29 through. the struts or push-bars 33. Means are preferably provided for adjusting the tension of the springs 31, such means, as herein shown, comprising adjusting screws 34L and disks 26 against which latter said springs bear.

It will be observed that the supports for the crushing rolls 27, and which supports comprise the bearing pins 28 and the bellcra-nk bearing-carriers 29, are pivoted outside of the chamber of the casing to the end head 15 said supports extending through openings 44.- in the casing head 15 intothe chamber of the casing, where the crushing elements are located;'tl1is construction affording means whereby the bearings for the said crushing rolls may be properly lubricated. as also means whereby dust from the interior of the casing may be excluded from the bearings of said rolls, as will hereinafter appear.

As the bearing-carriers 29 for the hammer rolls are pivot ally mounted on the end head 15. and as said end head is removable, as hereil'ibefore stated. it will be understood that the said hammer rolls and their carricrs may be bodily removed from the chamher of the mill. when necessary, by removing said end head from which said parts are supported; and in thus removing said end head the springs 31 which act on said bearing-carriers to force the hammer rolls towards the inner or crushing face of'the anvil ring, as also the holder 32 for said springs, and which is mounted on said end head, will also be removed with the latter.

Each of the crushing rolls 27 is carried upon a tapering portion 35 of a sleeve 36 and is securely held thereon by a. clampcollar 37, a key 38 interposed between the roll 27 and the collar3'7 and the sleeve 36 holdin these parts against rotation upon the SZIId'SlQGVG. By reference to'Fig. 1 of the drawings it will be seen that the sleeves 36, to which the crushing rolls 27 are attached so as to rotate therewith, project to a considerable distance horizontally on both sides of said rolls, or, in other words, to a considerable distance on both sides of a plane passing centrally through the anvil ring 23 and the said rolls. The said sleeves thus have wide hearings on the bearing pins 28 and the said bearing sleeves are centrally disposed with relation to a vertical plane passing through the anvil ring 23 and the hammer or crushing rolls 27. This construction is important in that itaffords proper bearings forthe rolls such as will enable them to produce the best results in operation and enable the bearings to withstand the wear to which they are subjected. A dust-guard collar 39 is preferably mounted upon the end of each sleeve 36 and is preferably held thereon to rotate therewith by means of screw threads, said collars 37 and 39 being held against ,rotation with respect. to the sleeves 36 by. means of set screws 40 interposedbetwcen said dust-guard collars 39 and said clamp-collars 37. The heads of the screws 40 are'preferably conical in form and enter suitable recesses in the collars 37, thereby retaining both the collars. 37' and the collars 39 in proper operative position.

Interposed between the bearing pins'28 and sleeves 36 are semi-cylindrical wear bushings or sleeves l1 rigidly or non-rotatively mounted on the outer or supporting faces of the spring-pressed bearing-pins 28 and providing bearings forthe sleeves 3G.

An oil pipe 42, mounted in a suitable groove in each bearingpin 28, provides means for oiling the bearing of each sleeve 36 from the exterior of the mill. The dust collars 39 are preferably provided with inwardly extending flanges 43 to form oil guards or locks for the bearings of the crushing or hammer rolls 27, the oil beingheld in'contact with the interior surfaces of the sleeves- 45 mounted in said bearing carriers and' which are held 1n place by elastlcrings or by centrifugal force when the rolls are in I washers 46- whichserve to press the said collars firmly against the face of the said head. The inside of the casingis provided with suitable linings or wearing parts, as 70,

wherever there is danger of wear taking place, except in-thatportion "of the lower.

half and-sides occupied by a curved screen 47. This screen is held in positionby being clamped between inwardly projecting portions of the end heads 14'and15, or against the linings 70, and suitable clamping bands- 48; the ends of said screen being riveted or otherwise secured to cross pieces 49' preferably integral with said clampingbands48; Any suitable means may be provided for securing the clamping bands 48 in place. Tn

lugs; so that by turning said nuts, to raise or lower said rods, the clamping bands may :be tightened'or loosened. The completely 'reduced material leaving the anvil ring 18 passes freely through the screen 47, and out at the discharge opening13.

' Ks hereinbefore described, scrapers 25 are mounted on the arms 21 of the rotating driving wheel or head 20, these scrapers being adapted to pick up the partly reduced material which fails to-pass through the screen 47 and discharge the same into a pocket 5Q, preferably formed in the upper portion of the side of the casing, as shown in Fig. 3. lnstead of the curved screen 4'7 a curved plate or surface of any kind, and arranged for .coiiperation with the rotating scrapers, might be employed.-

Arrangedin the pocket 50 is. afeeding device herein shown as a screw' or helix 51 arranged in a trough 7 5 communicating with the pocket which extends across the chamber of the mill. The feed screw 51' is driven by a sprocket-wheel 52 connected by a suitable chain with a corresponding s rocket wheel 53 on the main or driving sha 18 of the machine. This screw feeds the-material, discharged by the scrapers into the pocket 50.,to a point at'the front of the mill, thence past the discharge opening of a feed hopper 54, said discharge opening communicating with the said trough 75- which in turn communicates with a chute or pipe 55 down which the material passes to'a second feeding device 56, preferably also in the form of a screw or helix, and which is adapted to convey the material back to the crushing surface of the anvil ring 23. The feed screw- I 56 is preferably driven by a sprocket wheel 57 connected by a suitable chain with a sp1'0cket\58, carried by the forward end of the feed screw 51, and operates ina trough ortube 59 having a discharge opening at its bottom over the anvil ring, The hopper 54 communicates with the trough 75 of the uprial, practically no fresh material will be taken by thesaid feed screw, from'the feed hopper, and tl1is feed screw will be more or less full, depending upon the a mount of par tially reduced material delivered by the scrapers. 25' to the pocket 50. From these conditions it follows that the mill cannot be choked by, fresh material, because the carryingcapacity of the feed screw 51 for net material is limited by theamount of material taken from the pocket 50, and if the screw be full of partially reduced material taken from this-pocket practically no more material can be receivedat this time, and the entrance of fresh material to the screw is thus shut off and remains so until a diminishing return of partially reduced material permits fresh material to be taken'by the said feed screw.

- It. will be noticed that the wear bushings- 41 of the bearings for the crushing rolls are held in place on the outer or supporting faces of the spring-pressedbearing pins 28. By referring to Fig. 3 it will be seen that the several bushings 41 are'held stationary or rendered non-rotatable on the pins 28 by longitudinal ribs on' said bushings fitting grooves in said, pins. It follows from this that whenthe circles of the.bearing surfaces ,and the bearing surfaces remain nearly 'constant; while if the sleeves 36 contained attached bushings as in ordinary loose pulleys these bushings, Wearing faster than the bearingpins 28, would soon not fit the said bearing pins, and bearing surfaces eccentric with the said bearing pins would result. The dustrguard collars 39 are each preferably provided with an annular flange 60 extend ing into an annular recess ;61 in a bearingcarr1er'29', said'recess 61 terminating 1n an enlarged annular space 62 adapted to contain packing and to prevent anyexcess of oil from escaplng to the interior of the mill where it might do harm to the material being reduced.

The construction of the mill is such-that either end head -141 or 15 can be removed, for

the repair' or replacement .of parts, while the top case or cover 16' can be swung on its hinge so as to expose the working parts to afford access to the anvil-ring and crushing or hammer rolls in the chamber of the mill, or for the purpose of replacing the scrapers, screen or linings. The s ring'holder or casing 32, bolted to the hea 15,'or to the shaftbearing 63 carried by said head, centrally a curvature corresponding to the curvature.

' of the concave face of the anvil ring. This construction not only provides a hollow receptacle for the material being crushed but.

also provides a grooved track in which the hammer rolls run so that they will be more or less restrained fromlateral movements as their convex faces run in the said grooved 29 track.

It will be observed that the end head 15, which is bolted in place in such a manner as to be removed when desired, carries the pivoted bearing-carriers 29 which are mount-v ed on said end head, the latter also providing one of the bearings 63 for the main or driving shaft 18, the other bearing for said shaft being on the opposite end head 14. Also the said end head 15 supports the 30.spring s 31 exerting pressure on the pushrods or bars 33 acting on the ivoted bearing-carriers 29, and which springs serve to yieldingly p ess thecrushing or hammer rolls 27 outw rdly towards the anvil ring 23. 35 The operation of the mill is as follows:

Assume the pulley 19 to be belted to a suitable source of power and the mill to be operated at a speed sufficient to hold the material to-be reduced on the anvil ring by contrifugal'force; if, under these conditions, ore or other material of the right-size be fed to the mill-hopper 54 the rotating feed screw 51 at the bottom of this hopper conveys this material to the pipe or chute 55 discharging upon. thelower feed screw 56, and this screw delivers the material to. the reducing surface of the anvil ring 23 where it is more or less pulverized by passing between the crushing or. hammer-rolls 27 and the said anvil ring, 50.said rolls 27 rotating by frictional contact with said ring or with the interposed material; The material in process of reduction works tothe edges of the ring and drops therefrom upon thescrecn 47 and is moved along the same by the scrapers, the fine material passing'throughthe screen and out at the discharge opening 13, while the remainder or partly reduced material is lifted by. the scrapersto the pocket 50 to be returned'to the anvil ring, for further reduction, by the system of feed screws as hereinbefore described. 'Under normal conditions theiupper feed screw or conveyer 51 will take all the material which is in the- 66 pocket: 50 and as much fresh material as the capacity of the said feed-screw or conveyer will permit. This makes the feeding of the material automatic and prevents clogging from over-feeding;- v.

It will be understood that, if desired, the 70 mill may be operated without the'screen or scrapers, under which circumstances thereduced material will be discharged directly from the-mill; and, if desired, may be separated or screened by external means and the coarse material be returned to the mill for. further reduction.

lVhile, in order that our invention may be properly understood, we have described the same as embodied in a specific construction, we wish it to be distinctly understood that we do not limit ourselves to the precise construction shown; it being obvious that many changes might be made therein without departing from the spirit and scope of our invention. For example, while we have herein shown. our improved crushing or pulverizing mill as being constructed with four spring-pressed hammer-rolls, operating in connection with the positively driven rotating anvil ring, it will be understood that any desired number of saidrolls, from one to fouror more, may be employed without departing from our invention.

While we have herein shown a horizontally disposed driving shaft 18 rotating infixed bearings and carrying an anvil ring 23 rotating in a vertical plane within the casing forn'iing the chamber of the mill, we do not wish the term horizontal, as used with reference to the positionof the driving shaft, or the term vertical, referring to the position of the anvil ring, in the appended claims, to be strictly limited to hori zontal or vertical planes; as it is obvious that the mill might be tilted slightly, thereby changing the positions or planes of the said shaft and ring, without departing from the invention; so that the terms horizontal and vertical, as used in the claims in connection with the driving shaft and anvil ring, may be understood to mean approximately horizontal and vertical.

Having thus described our invention we claim and desire to secureby Letters Patent:

1. in a crushing mill, the combination with an anvil ring having an interior crushing surface, of a horizontal shaft by which said ring is carried, a ,fixed bearing for said shaft, a plurality of frictionally driven crushing or hammer rolls, bearings on which said rolls are journaled, bell-crank carriers for said bearings, a stationary part to which' said carriers are pivoted, and springs acting on said carriers and serving to force said hammer rolls toward the crushing surface of the said anvilring.

In a crushing mill, the combination with a suitable casing, of an anvil ring rotatiiwvertically within said casing, a horizon teams rolls toward the crushing surface'of said anvll ring.

3. In a crushing mill, the combination with a suitable casing, of a horizontal shaft having a fixed bearing, an anvilring mounted on said shaft and rotating in a vertical plane'wifhingsaid casing, a plurality of ham:

mer rollsfco'operating with said anvil ring, a;

plurality of bell-crank bearing-carriers piv otally mounted outside of said casing and extendinginward through openings in said casing, bearing pins securedito said carriers and supporting said hammer rolls within said casing, and springs acting on said bear-,

ing' carriers, at points remote from their pivots, and serving to yieldingly force the' said hammer rollstoward the interior crush? ing surface of said anvil ring.

4. In a crushing mill, the combination with a suitable casing, of a liorizontalshaft having a fixed bearing, an anvil ring mounted on said shaft and rotating in a vertical plane within saidlcasing, a plurality of ham.

mer rolls cooperating with said anvil ring, a plurality of bell-crank bearing-carriers pivot-ally mounted outside of said casing and extending inward through openings in said casing. bearingpins secured to said carriers and supporting said hammer rolls within said casing, and springs acting on said bear- -ing carriersv at points remote from their pivots, and serving to'yieldingly force the .said hammer rolls toward. the interior crushmg surface of said anvil ring, said anvil ring being an open one so that the crushed material may be discharged fromboth sides of its crushing face.

5. In a crushing mill, the combination with a horizontal shaft mounted to rotate in a fixed bearing or bearings, and an anvil I ring carried by said shaft and having a concave crushing "face, of a plurality of convex-faced hammer rolls, a plurality 'of pivoted supports for said rolls, a stationary 'part to which said supports are pivoted, and springs acting on said pivoted supports and serving to press said hammer rollstoward the crushing fa'ceof the said anvil ring so as to cause said rollsto rotate frictionally whenever said. anvil Jring is'in rotation.

In a crushing mill, the combination with a horizontal-shaft journals-d inifixe'd bearings, of a hollow driving wheel "or head carried by said shaft and arranged to rotate in a vertical plane, an anvil connected with said hollow driving wheel or head by suitable arms leaving the said anvil. rin open so that the material may be discharge from both sides thereof, a plurality of crush mg or hammer rolls, supports by which said rolls are carried, a stationary part to which said supports are pivoted. and springs actmg on sand supports and serving to force said crushing rolls yieldingly toward the inner or crushing face of the saidanvil ring.

7. In a crushing mill, the combination with 'acasing having a side opening or openings, of an anvil ring entirely inclosed by said casing and rotating in a vertical plane within the same, a horizontal shaft by which said r ng is carried, fixed bearings m which said shaftrot-ates, a plurality of crushing or V hammer rolls cooperating'with saidanvil ring, suppo'rts for saidhammer rolls pivoted outside of said casing and extending within the same through the said opening or openings, and springs, acting'on said-supports, for forcing the said hammer rolls toward the interior crushing face of said anvil ring,

8L In a crushing mill, the combination with a suitable casing, of a horizontal shaft journaled i n fixed bearings, a hollow driving wheel or head carried by said "shaft within saidcasing and arranged to rotate in a vet tical plane, s rapers carried by said wheel or head, an anvil ring connected with said h'ol-' low driving Wheel or head by suitable arms leaving the said anvil ring open so that the material may be discharged from both sides' thereof, a plurality of crushing or hammer rolls, supports by which said rolls are carried, a curved screen mounted in said casing and from which said scrapers can take partly crushed .material, and iiiea'ns for ie-' turning such partly crushed material raised by said scrapers to said anvil ring for further crushing. a p

9. In a crushing mill, the combination with a casing having a side opening or opening's, of an anvil ring rotating in a vertical plane within said casing, means for support ing and rotating said anvil ring, scrapers'rosaid anvil ring, supports for saidhammer rolls pivot/ed outside of said: casing and extending within the same through the "saidopening or openings, a curved screen mounted in said casing and from which said scrapers can take the partly crushed materiah'and tating-with said anvil ling, apliirality of crushing or hammer rolls cooperating with v means for returning such partly maii terial raised by said scraperstofsaidanvi'l 1 E 1 ring for further ,cr'ushing.

10. In a cinishfiig a111, comprising fleasing, the combination with a POSItiVlY-ari'i 'eli wheel or head rotating in a vertical -'p'Ia within said casin of an anvilnug canie'd by said wheel or heard, -scrapers also carriedby-said wheel or head, one ormore frictions ally driven crushing or hammer rolls yield ingly pressed toward said ring and cooperating therewith, acurved screen mounted in said casing and partially surrounding said wheel or head, and from which screen said Scrapers can take partly crushed material, and means for returning such partly crushed material to said anvil-ring for further crushing.

11. In a crushing mill. the combination with a suitable casing provided at or near its top with a pocket. of a positively driven wheel or head rotating in a vertical plane within said casing, an. anvil-ring carried by said wheel or head, scrapers also carried by said wheel or head. a screen partly surrounding said wheel or head and from which the said scrapers can take partly crushed material and carry it to said pocket, and means for returning such material to the anvil ring for further crushing.

12. In a crushing mill, the combination with an anvil ring rotating in a vertical plane, of one or more crushing or hammer rolls cooperating with said anvil ring, a screen partly surrounding said anvil ring circamferentially, and scrapers operatively conne ted with said anvil ring and adapted to collect partly crushed material from said screen.

13. In a crushing mill, the combination with a suitable casing provided with a -pocket, of crushing, elements within said casing, means for feeding material to be crushed to said crushing elements and means for conveying partly reduccdmaterial to said pocket whence it will be returned by the feeding means to said crushing elements for further reduction together with a greater or less amount of fresh material depending upon the amount of material carried to the said pocket for recrushing.

14.. In a crushing mill, the combination with a rotating anvil ring and crushing or hammerrolls ioldperating therewith, of a casing provided with a pocket exterior to said ring, a feeding device in said pocket, .a source of supply for fresh material with which said feeding device communicates,

means for separating the completely reduced material discharged from said ring from partially reduced material so discharged, and means for conveying such partially reduced material to the said pocket; whereby the amount of fresh material fed to the mill will be regulated by the amount of partially reduced material returned to said pocket for Further nvneliinnr nnrl nvav'Foarlinnr n'F flan which said feeding devicecommunicates, a curved screen within sald casing, and

scrapers rotating with said ring and serving,

in coiiperation with said screen. to return the partially reduced material tothe said pocket; whereby the amount of fresh material fed to the mill will be regulated by the amount of partially reduced material-returned to said pocket for. further crushing, and overfeeding of the millwill thereby be automatically avoided.

16. In a crushing mill, the combination with a casing comprising a removable end head, a horizontal shaft having one or more fixed bearings atforded by said casing, an

' anvil ring carried by said shaft and rotating in a vertical plane, hammer rolls cooperating with said ring, and bearing-carriers from which said rolls are supported and which are mounted on said end head, so that the said rolls with their carriers may be removed by' removing said end head. a

17. In a crushing mill, the combination with a casing comprising a removable end head, a horizontal shaft having one or more fixed bearings afforded by said casing, an anvil ring-carried by said shaft and rotating in a vertical plane, hammer rolls cooperating with said ring, bearing-carriers from which said rolls are supported and which are mounted on said end head, springs, acting on said bearing-carriers, for forcing said rolls towards the inner face of said anvil ring, and a holder for said springs also mounted on said end head, so that the said rolls with their carriers and also said springs and their holder may be removed by removing said end head.

18. In a crushing mill, the combination with the frame of the machine and a horizontal driving shaft, of a vertically rotating wheel or head fixed to said shaft, an anvil ring carried by said wheel or head, a plurality of crushing or hammer rolls cooperating with said ring, a plurality of pivoted bearing-carriers from which said rolls are supported, and springs acting on said bearing-carriers and serving to press said rolls yieldingly toward said anvil ring, said springs being contained in :a single holder or casing removably moun ed on the said frame of the machine.

19. In a crushing mill, the combination with a horizontal shaft-rotating on fixed bearings, of a vertically disposed anvil ring carried by said shaft, acrushing or hammer roll cooperating with said anvil ring, a \l Yfld'fllq 5100 In 0 ("1 1'1; D"

bearings, of a vertically disposed anvil ring carried by said shaft, a plurality of crushmg or hammer rolls within the said ring, sleeves to which said rolls are connected to rotate therewith, bearing pins or-studs on which said sleeves rotate, pivoted bell-crank carriers supporting said pins or studs, springs acting on said carriers and serving toyieldingly press said rolls radially outwardly towards said ring, and, means for supporting saidsprings.

'2 In a crushingmill, the combination- With 'an anvil'ring mounted to rotate on a 1'" a fixed horizontal axis, and having an lnterior crushing surface, a crushing roll arranged to be; frlctionall'y driven by the rotat on of said interior ring surface, a shaft on which said roll rotates'and which is yieldingly supported, the said roll'having a bearing which projects on both sides'of a vertical plane v passing through the center ofsaid rotary anvil ring and said roll.

22. In a crushing mill, thecombination with a horizontal shaft and fixed bearings in which said shaft rotates, of an anvil ring rotating in a vertical plane, crushing or hammer rolls cooperating with said ring, said hammer rolls hav ng bearing-sleeves projecting on both sides of a vertical plane passing through the. centers of said.rolls, shafts on which said sleeves are journaled, and yielding supports for said shafts.

23. In "a crushing mill, the combination with a casing comprising an end head having an opening, a horizontal shaft mounted in fixed bearings afforded by said casing, an anvil ring carried by said shaft and rotating in a verticalplane withi'n the chamber of vil-ring, of acrushing or hammer-roll co operat ng therewith, a bearin -carrier, a bearing pin or stud supported i said carrier and on which the said roll-is journaled, means for conducting a lubricant to the bearing of said roll, and an oiland dustguard between said bearing carrier and the bearing of said roll afforded by said pin or stud, said oiland dust-guard serving to prevent the escape of oil fromthe bearing of said roll and to exclude dust from said bearing, and said oiland dust-guard conistln'g of a collar having an inwardly extending flange: to prevent the escapetof oil, and a longitudinally extending flange entering a recess in'said bearing-carrier to prevent the entrance ofhdust.

:25. In a crushing mill, the combination .with a rotating anvil-ring, of a crushing or hammer roll cooperating with said ring,

sleeve to which said roll is attached to rotate therewith. parts of said sleeve and roll having inclined or tapered faces, a collar for retainingsaid roll in place on said sleeve, and adjusting means for forcing said collar againstsaid roll. c 26. In a crushing mill, the combination with a rotating anvil-ring, of a crushing or hammer roll cooperating with said ring, 'a sleeve to which said roll 1s attached to rotate therewith and between which sleeve and roll are inclined or tapered faces, a collar for retaining said roll in place-on saidsleeve.

adj ust-ing means for forcing said collar against said roll, a second collar on said sleeve constructed to form an oiland dustgnard, and means between the said collars by which they may be retalned in position on said sleeve, and by which also the first- -named collar may be held in contact with the said roll. I v

27. In a" crushing mill, the combination with a rotating anvil ring, of a crushing or hammer roll cooperating therewith, an end head having an openmg, a pivoted bearingcarrier from which sald' roll is supported, said bearing-carrier being mainly exterior -.to said end headbutha'ving aportion extending into said opening, and a dust-guard closing said. openin sald dust-guard comprising a. collar'an an elastic washer both mounted on said bearin -carrier.

28. In a crushing mi 1, the combination with a casing comprising a removable end head, a horizontal shaft within said casing. a' hollow wheel or head mounted .on said shaft, and an anvil ring within said cas ng, of a plurality of crushing-or hammerrolls, bearings for said rolls, pivoted carriers for said bearin s, springs acting on said' carriers and a apted to'causesaidrolls to coact with said ring, and a spring-holding case attached to said casing andsiproviding an abutment for said s rings, sai carrier's, springs and s ring-t oldmg case bein mounted on an thus removable withtai 1 end head. 4

29. In a crushing with an anvil ring and a horizontal shaft b which said ring is carried, of acrnshi-ng r0 1 coiiperating with said ring, a pivoted, bellcrank bearing-carrier from which said roll is supported, a spring for holding said roll in engagement with said ring, and a ushbaror rod connecting said spring an said carrier, and acting on the latter at a point remote from its pivot.

min, the combination,

30. In a crushing mill. the combination or shaft Within the chamber of said casing with. a rotating anvil-ring,,of a crushing or han'imer roll, means for yo'bldingly-pressing said roll toward said ring, a bearing-pin upon which said'roll is mounted said bearing-pin being provided with a groove, a nonrotatable wear-bushing interposed -between said pin and roll, and an oil tube located in said groove and extending outward therefrom., v v

31. In a crushing mill, the combination with a casing comprising a removable end head having an opening, a horizontal shaft -mounted in fiXed bearings afforded by said casing, an anvil ring carried by said shaft and rotating in a vertical plane within the chamber of said casing, a spring-pressed bearing-carrier pivotally mounted on and thus removable with said head, a bearing pin or shaft fixed to said carrier and extend ing through said opening into the chamber of said casing, and a crushing or hammer roll rotatively mounted on said bearing pin and cooperating with the said anvil rin In a crushing mill, the combination with an anvil ring rotating in a vertical plane, of a casing comprising a removable, vertical, end head having: an opening on openings; pivoted, spring-pressed bearing carriers mounted on the exterior of said head; bearing pins or shafts fixed to said hearing carriers and extending through said opening or openings into the chamber of said casing, and crushing or hammer rolls rota lively mounted on said bearing pins or shafts within said casing and yieldingly pressed towards the crushing surface of the said anvil ring.

In testimony whereof we afiix our signatures, in presence of two witnesses.

THOMAS LEGGH'IT STURTEVANT. THOMAS JOSEPH STUKTEVANT. Witnesses V. H. ELIAS, H. G. ALLBmon'r. 

